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関連する概念動画

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.8K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.8K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.6K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.6K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
9.6K
Structures of Solids02:22

Structures of Solids

14.2K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
14.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.4K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.4K
Network Covalent Solids02:18

Network Covalent Solids

13.5K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.5K

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関連する実験動画

Updated: Jul 15, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

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6つ連結した三角形のプリズマノードから構成された単結晶の3次元共性有機フレームワーク

Ying Yin1, Ya Zhang1,2, Xu Zhou1

  • 1College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.

Journal of the American Chemical Society
|October 4, 2023
PubMed
まとめ
この要約は機械生成です。

研究者らは新しい3D共振有機フレームワーク (3D COF) を作成するための新しい三角プリズマノードを開発した. この材料は,硫黄六酸化物 (SF6) の例外的な吸附性と選択性を示し,ガス捕獲のための多孔質な材料を進めている.

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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関連する実験動画

Last Updated: Jul 15, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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科学分野:

  • 材料科学
  • 化学について
  • ナノテクノロジー

背景:

  • 3Dコヴァレント有機フレームワーク (3D COF) の構造的な多様性は,その適用を妨げています.
  • 3D COFライブラリを拡張するには,高度に接続された多面体のノードの開発が不可欠です.

研究 の 目的:

  • 新しい6つ連結した三角形のプリズマノードを設計し合成する
  • このノードを使用して新しい3D COFを構築し,その特性を探求します.
  • この3D COFのガスの吸附アプリケーションの可能性を調査する.

主な方法:

  • トリフェニルベンゼンの6つ連結した三角形のプリズマノードの合理的な設計.
  • イミン凝縮による新しい3D COF (3D-TMTAPB-COF) の構築.
  • 結晶構造とトポロジー (acs,6倍相互浸透) を決定する単結晶X線 difraktion.
  • SF6とN2のガスの吸収測定は298 Kと1 barで実施した.

主要な成果:

  • 新しい6つ連結した三角プリズマノードが成功しました.
  • 希少な6倍相互浸透ACSトポロジーを持つ新しい3DCOF (3D-TMTAPB-COF) が構築されました.
  • 3D COFの大きな単結晶 (∼15 μm) は,調節器なしで溶熱法で得られた.
  • 3D-TMTAPB-COFは高いSF6吸収能力 (60. 9cm3 g-1) とSF6/N2の選択性を示した (335).

結論:

  • この研究は,調節器のない溶熱方法による強い共価結合を用いた大型単結晶3DCOFの成長の可能性を確認した.
  • 3D COF を構築するための新しい可能性を提供する新しい三角プリズマノードが報告されました.
  • 合成された3D COFは,SF6キャプチャの有望な性能を示し,既存の多くの結晶の多孔材料を上回っています.